Biasi Riva Plus Combi Installation & Operation Instructions page 20

9. Venting Cont.
B Standard separate horizontal fl ue kit (Exhaust & intake outside)
Various twin (split) pipes kits and optional accessories (elbows) are available to assist in the
termination of the fl ue where the boiler is installed in a location remote to an outside wall.
These kits allow for separation of the air supply pipe from the pipe that discharges the exhaust
gasses. Consequently it is possible to extend the fl ue system to a greater distance than that
provided by the standard coaxial horizontal fl ue.
If either an additional 45° or 90° accessory elbow is used then the maximum permissible lenght
of either pipe must be reduced by 3.0 ft or 5.4 ft respectively. The sum of the lenghts of the two
horizontal part must be less than 49.2 ft.
Installation:
• Drill holes B & C (on the wall template) through the outside wall that is less than
18"thick.
• Cut the pipes as necessary so that no more than 6" of intake pipe protrudes from the
house and the exhaust pipe is a minimum of 4 inches longer than the intake pipe.
• Slide the Intake and exhaust pipes through the respective holes.
• Slide one rubber wall trim piece on each pipe from inside and one from outside.
• Attach each collar to the boiler with the gasket and screws provided.
• Insert each elbow into its corresponding collar.
• Connect each pipe to its corresponding elbow (as shown in the diagram).
• Secure end cap on the intake and exhaust pipe outside the house
20 RIVA PLUS COMBI MANUAL
Figure 9.4 (Twin pipe Ø 3.25 in)